Check Point notified Google about the threat last month, and it "promptly removed" the offending apps from the Play store. But before Google pulled them from the store, they racked up between 1 million and 4.2 million downloads.

If you were among those who downloaded one of these malicious apps, your device could still be at risk, Check Point warned. Users will need to manually remove them to ensure they won't be charged fees for services they never signed up for. Head over to Check Point's blog post and scroll down to the chart at the bottom to see the full list of infected apps.

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ExpensiveWall is actually a variant of a piece of malware found on Google Play that McAfee sounded the alarm about in January. Between the latest crop of infections and the earlier ones, this malware family has been downloaded between 5.9 million and 21.1 million times, Check Point said.

It's an ongoing issue. Check Point said that after the batch of affected apps it discovered were removed, another sample infiltrated Google Play "within days…infecting more than 5,000 devices before it was removed four days later."

"What makes ExpensiveWall different than its other family members is that it is 'packed' – an advanced obfuscation technique used by malware developers to encrypt malicious code – allowing it to evade Google Play's built-in anti-malware protections," Check Point wrote.

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